Jos-ep ziegler



'To all w/wmit zjmy co ncer'm' UNITEDQS'IZATEST" PATENT Erica.

Jos-En ZIEGLER, 011 'HAjI m-URGPUH LENHORST, enmmnngissienoni o FRANZ rR Tzso n & 00. 01? same PLACE.

ESSENCE OF VlOL-ETS.

' sPncIFIoA'rmN forniing'part of Letters' Batent Nb. 601,198,.dated March 22, 1892 Be it known that I JOSEF ZI-E'GLER, chemist, of Hamburg-Uhlenhorst, Germany, have invented new and useful Improveriients'in Ma r ufac'turing Artificial Essenceor Essential Oil of V-iolet s,-of which the following is a specification. The present invention. relatesto a process for the manufacture.oii artificiallessence or essential oil of violets and ishiefiy remarkable for its great simplicity and cheapness of production as Well as for lthe cheapnessofi the raw materials used. Hitherto artificial .violet-scent has been produced inthe' wellknown manner of condensing citral Withacetone, whereupon aldchydes and ketones form un deinthe influence .of. alkalies or alkaline earths new substances with formation of \i'aten. The product thus obtained (psendojo- 26' non) isconverted by diluted mineral'acid into jonon. This process is costly and the amount yielded is very small. I The inventors came tothe conclusion that thclplants must use, when-producing. this scent, materials other than alkalies or alkaline earths and that pe1--.

haps combinations of iron played a part in it under the iniluencc of light and oxygen. Ex-

pcriments have revealed. the surprising factthat in-the presence of substances which with Water yield oxygen by cold or by hot processaprodu'ctof condensation is obtained from -eitra'l or from OllS containing cit-ral'and from acctone,which product when boiled with weak ent invention consists in eitr'al', r'o'ils conoxidizing substances-produces a volatile oil having"thdfragrance.0t flowers. u The newand essential featnre'of the prestaining citral, and acetone"beingtreatedin diluted solution of alcohol with such substances as usually have an oxidizing elfect, but which in'the present case, probably owing tothetemporary arrangement of atoms, protect or condnct the reaction in the right direction, suclisubstances as hypochlorites of alperoxidcaubegused with advantage.

The-in z'en'tion further consists in the'pr'od not so obtained being "simultaneously con verted by means ofiweakpxidizin g substances kaliesoralkaline earthsas well as barium a. smilin 616,213. (Specimens.)

and freedfronrimpurities. For this purpose chlorid of ironor arsenic-acid maybe used with advantage, The result attained is'the more surprisingand i-emarkablesince chlorid' 0t 1ime,jfo r instancc,fwith onlyacetone or alcohol, yields-chloroform.

A practical application of the newprocess, is as follows: Oiie kilogram of acetone and 0.5- kilogram of :ci-tral are dissolved in 1.5 kilograms of alcohol;- and 1 liter ot-freshly filtered clear .concen tinted solution of .chlorid of lime is added, thcmixt'ure being: cont-inn; ally stirred}: The mass becomes heated and isleft to stand fors'everal days, or the heat ing may be increased by boiling it in a reflux cooling apparatus and so in ai ntainclil for about six hours; hen the liquid has-cooled, it is diluted with about ten liters of water the oil that collects 'onthe surface is skimmed-oil,

and small quantities of superfluous acetone and citral whichdid not take part iii'the reaction are removed from thisLoil by a weak jet bf steam; Thcoil is then boiled with five 1 By-the action of th'esolution of chlo'rid distilled again \vithstcam, and thisfi actional distillation repeated',-if necessary. The volatile oil ,orcssence obtain-ed in such manner does-not. easily evaporate, is of yellowish c01or,'and has a snicllresembling that of sail dal-Wpod-pr .finecedar-wood; and it properly diluted it has a n arlted smell ot freshly-girth cred; violets. '1 stead of citrala do' blequaiiti-tyiof Indian Verbena oil (lemon-gra ss) may be usedliters o't'dilutcd solution'of chlorid of iron of about 11.025 specific gravityfor at least one- 'day. of irolinot only is thesubstance altered into in thepresen't example, tl1c1efore,., 1 kilogram.

The process're'maiiis .the same. 2 Instead of a satnratedsqlutioii of chlorld of lime O. 25 kilo" gram of barium peroxid may be jused, the otherproportions remaining as describcd,said

barium peroxid being suspended in 0,5=kilogram of water and added to'tlie solution of cittooml and of acetone in alcohol. Then the so lution is heated and theproeess conducted as described. v

Having now particularly deseribedand ascertained the nature of the said invention and in what manner the same is to be performed, I lec re that what I claim is--- 1. The process of'manufacturing artificial oil of violets, which consists in treating citral or oils containing citral in a mixture of acetone and dilutedalcohol, with an aetivecoxidizing agent such as barium. peroxid, and

- then further oxidizing the product by boiling it with ferric chlorid, substantially as described.

2. The process of manufacturing artificial 'oil or essence of v olets, consisting in'dissolving one kilogram of acetone and one-half kilogram of citral in one and one-half kilograms ofalcohol and adding one liter of freshly-prepared clear saturated solution of chlorid of lime, the mixturc being constantly slim-ed and then heated for a few hours in a reflux cooling apparatus, the oil so obtained being, then boiled for a considerable time in fire liters ofa diluted solution of ferric ehlorid and finally distilled, substantially as described. In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

" 'Josnn znzcrinn. \Vitnesses:

JOSEF Sunn, v E. H. L. MUMMENILOFF. 

